What a temperature change this will be: from a hi/lo of -7/-12°C (feels like -14 with the windchill!) in Toronto to a hi/lo of 30/22°C in Chennai, in the southeast of India. You can check out weather in Chennai, India at weather underground.
I still haven’t planned much, but now I’m considering flying to the Andaman Islands (1000km east in the Indian Ocean, south of Burma, but still part of India) and back to Chennai.
Update: here is a map of the path I ended up taking through India.